Denso 4 wire Lambda Sensor

[Martin]

Hi,

Will the Denso 234000-9200 4wire sensor work instead of the usual LSM11 on an M4 or 48?

Its the 4 wire denso found on Subaru`s


Thanks
M

[Martin]

Has anybody tried Denso 4wire sensors instead of Bosch Sensors?

[RossB]

Is this a wideband sensor??? I have never tested one but have always assumed that it is narrow band.

[Martin]

Ross,

I think its wideband since you can see the lambda reading on the reflashing software some guys use on Subarus

This would not be possible with narrowband....



22690 AA501
Denso
08H28
234000-9220


Wire Colours
1.Black
2.Black
3.Blue
4.White

[RossB]

What model subaru is this from? Is it the front or rear sensor? I would normally associate those colours with a narrow band sensor with the 2 black wires being for the heater, white 0v and blue signal.

[carchitect]

Here is a document I found from the '06 Lexus IS250/350 new car features handbook. They use A/F sensors on the primary and heated O2 sensors for secondary to monitor the cats.

Air Fuel Ratio Sensor and Heated Oxygen Sensor
1) General
* A planar type air-fuel ratio sensor and a cup type heated oxygen sensor are used.
* The basic construction of the oxygen sensor and the air-fuel ratio sensor is the same. However, they are
divided into the cup type and the planar type, according to the different types of heater construction that
are used.
* The planar type air-fuel ratio sensor uses alumina, which excels in heat conductivity and insulation, to
integrate a sensor element with a heater, thus improving the warm-up performance of the sensor.
* The cup type heated oxygen sensor contains a sensor element that surrounds a heater.



2) Characteristics
As illustrated below, the conventional heated oxygen sensor is characterized by a sudden change in its
output voltage at the threshold of the stoichiometric air-fuel ratio (14.7:1). In contrast, the air-fuel ratio
sensor data is approximately proportionate to the existing air-fuel ratio. The air-fuel ratio sensor converts
the oxygen density to the current and sends it to the ECM. As a result, the detection precision of the air-fuel
ratio has been improved. The air-fuel ratio sensor data is read out by a hand-held tester.

[Martin]

This sensor is found on the N12

[RossB]

This is a type of narrow band sensor but the ECU runs it in a different way so that they can get a more linear output from it. They do this by applying a voltage to it and measuring the current required to maintain a constant voltage. Lambda is calculated as a function of the current. This is more like a Bosch LSU sensor opperation than the LSM sensor used in the M4/48/8 except that the LSU uses a seperate pump cell to maintain the constant output voltage and it is the current to the pump that is measured and not the current applied to the sensor itself as is the case with the Denso sensor. As far as I know we have not tried to run one of these sensors but it would be more likely that an M800 or PLM could run it than an M4/48/8. Don't try this at home though as you may damage something!

The planar design has more to do with fast warm up than the actual characteristic of the sensor itself.